Design a logging library that batches writes to disk to minimize I/O. Implement flush policies based on time, buffer size, and log level. Discuss how you'd test durability guarantees without actual disk access.

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Stay specific. One example, told well, beats three told fast. Make your decisions visible — what you chose between. End on what changed, for whom.

Design a logging library that batches writes to disk to minimize I/O. Implement flush policies based on time, buffer size, and log level. Discuss how you'd test durability guarantees without actual disk access.

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